#define _CRT_SECURE_NO_WARNINGS

#include <stdio.h>
int main()
{
	int flag = 0;
	int a = 0, b = 0, c = 0;
	while (scanf("%d %d %d", &a, &b, &c) != EOF)
	{
		if (a + b <= c || a + c <= b || b + c <= a)
			printf("Not a triangle!\n");
		else if(a!=b && b!=c && c!=a)
			printf("Ordinary triangle!\n");
		else if(a==b&&b==c)
			printf("Equilateral triangle!\n");
		else 
			printf("Isosceles triangle!\n");
	}
	return 0;
}

